.xr-header{
    display: flex;
    position: fixed;
    box-sizing: border-box;
    width: 100%;
    max-width: 640px;
    height: 2.3rem;
    top: 0;
    z-index: 200;
    border-bottom: 1px solid #ddd;
    line-height: 2.3rem;
    text-align: center;
    background-color: #f8f8f8;
}

.xr-header > .xr-header-left{
   flex-basis: 3rem;
   flex-shrink: 0;
   text-align: center;
}

.xr-header > .xr-header-title{
  flex-grow: 1;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}



.xr-header > .xr-header-right{
  flex-basis: 3rem;
  flex-shrink: 0;
}







